[PHP-DEV] Enable error_handler callback parameters to be passed by reference

[Thomas Bley]

In userland it is sometimes necessary to extend PHP's notices/warnings with 
additional information (e.g. username from session, stack trace, etc.)
I'm proposing to enable error_handler callback parameters to be passed by 
reference to be able to append additional data to error messages.

Example:

<?php
ini_set('error_reporting', E_ALL);
ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', 'php_error.log');

function myErrorHandler($errno, &$errstr, $errfile, $errline) {
  if (!empty($_SESSION['username'])) {
    $errstr .= ', username: '.$_SESSION['username'];
  }
  return false; // continue normal error handler
}

set_error_handler("myErrorHandler");

function test() {
  echo tests; // Use of undefined constant tests
}

test();

Gives in php_error.log:
[21-Jan-2015 04:32:26 UTC] PHP Notice:  Use of undefined constant tests - 
assumed 'tests', username: ... in error.php on line 17

Instead of:
[21-Jan-2015 04:32:26 UTC] PHP Notice:  Use of undefined constant tests - 
assumed 'tests' in error.php on line 17

Regards
Thomas

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